Common Safety Instructions for Vacuum Generator Unitasking type

Safety instructions

This safety instructions aims to prevent personal injury and damage to properties by requiring proper use of PISCO products. Be certain to follow ISO 4414 and JIS B 8370.

ISO 4414

Pneumatic fluid power…General rules and safety requirements for systems and their components.

JIS B 8370

General rules and safety requirements for systems and their components.

This safety instructions is classified into “Danger”, “Warning” and “Caution” depending on the degree of danger or damages caused by improper use of PISCO products.

Danger

Hazardous conditions. It can cause death or serious personal injury.

Warning

Hazardous conditions depending on usages. Improper use of PISCO products can cause death or serious personal injury.

Caution

Hazardous conditions depending on usages. Improper use of PISCO products can cause personal injury. or damage to or possible damage to property.

Warning

1. Selection of pneumatic products

1. A user who is a pneumatic system designer or has sufficient experience and technical expertise should select pneumatic equipments.

2. The products listed in this web site have various conditions of use.
Therefore, the suitability for the system should be determined by a person with sufficient knowledge and experience, such as a pneumatic system designer or a person who determines the specifications, after performing analysis and testing as necessary.
The guarantee of the desired performance and safety of the system is also the responsibility of the person who has decided on the suitability of the system.
All designers are required to fully understand the specifications of PISCO products based on the latest catalog or information and configure the systems considering the possible failure of the equipment.

2. Pneumatic equipment should only be handled by persons with sufficient knowledge and experience.

1. Compressed air is dangerous if handled improperly. Assembly, operation and maintenance of machines and equipment using pneumatic devices must be carried out by persons with sufficient knowledge and experience.

3. Never handle machinery / equipment or remove equipment until safety is confirmed.

1. Before inspecting or servicing machines / devices, make sure that workpiece fall prevention measures and runaway prevention devices are installed.

2. Before removing the equipment, make sure that the above safety measures are taken, shut off the supply of compressed air and the power supply of the corresponding equipment, and exhaust the compressed air in the system. .

3. Restart the machines with care after ensuring to take all preventive measures against sudden movements.

Warranty details

In the event of a failure of the product due to our fault, one of the following measures will be taken promptly.

1. Free provision of replacement for the product

2. Free repair of the product at our factory

Disclaimers

The aforementioned warranty does not apply if the cause of the failure is one of the following

1. By a natural disaster, a fire except our responsibility, an act by a third party, intentional or negligence of the customer, etc.

2. By when the product is used beyond the specifications described in our catalog or instruction manual, or when it is used by a manner other than that described.

3. By modification of the product, or alteration of the structure, performance or specifications without our involvement.

4. By an event that cannot be predicted by the evaluation items and countermeasures known at the time of delivery.

5. By the event that is able to be evaded if your machine or equipment has equipped with functions or structures that are comprised in a common sense when this product is incorporated in your machine or equipment.

Additionally, the above warranty is limited simply to the product itself. The damage induced by the trouble of the product will not be compensated.

*) Please note that these safety instructions are subject to change without notice.

Common Safety Instructions for Products Listed

PISCO products are designed and manufactured for use in general industrial machines. Be sure to read and follow the instructions below.

Danger

1. Do not use PISCO products for the following applications.

1. Equipment used for maintaining / handling human life and body.

2. Equipment used for moving / transporting human.

3. Equipment specifically used for safety purposes.

Warning

1. Do not use PISCO products under the following conditions.

1. Beyond the specifications or conditions stated in the catalog, or the instructions.

2. In the direct sunlight or outdoors.

3. In locations subject to excessive vibration and shock.

4. In an atmosphere or in a place where exposuring or adhering to corrosive gases, inflammable gases, chemicals, seawater, water, or steam.

*) Some products can be used under the condition above conditions. Refer to the details of specifications and conditions of each product.

2. Do not disassemble or modify PISCO products, which affect the performance, function, and basic structure of the product.
3. Do not touch the release-ring of a push-in fitting when there is a working pressure. The lock may be released by the physical contact, and tube may fly out or slip out.
4. Frequent switchover of compressed air may generate heat. There is a risk of causing burn injury.
5. If PISCO product itself generates heat by an adiabatic compression or etc., be sure to use it within the operating temperature range, including the heat generated by the product.
6. Avoid any load on PISCO products, such as, a tensile strength, twisting and bending. Otherwise, there is a risk of causing damage to the products.
7. As for applications where threaded body or tubes swing / rotate, use Rotary Joints, High Rotary Joints or Multi-Circuit Rotary Block only. There is a risk of damage to the product itself due to swinging or rotation.
8. As for the condition required to dissipate static electricity or provide an antistatic performance, use antistatic products only, and do not use other PISCO products. There is a risk that static electricity may cause system failure or malfunction.
9. Do not use products other than those of spark-resistant (anti-spatter) or brass specifications in places where sparks may be generated.
There is a risk of causing fire by sparks.
10. Turn off the power supply to PISCO products, and make sure there is no residual air pressure in the pipes and equipment before maintenance. Follow the instructions below in order to ensure the safety.

1. Make sure the safety of all systems related to PISCO products before maintenance.

2. Restart of operation after maintenance shall be proceeded with care after ensuring the safety of the system by preventive measures against unexpected movements of machines and devices where pneumatic equipment is used.

3. Keep enough space for maintenance and inspection when designing the circuit.

11. If there is a risk of damage to the machine or equipment or a disaster due to leakage of the fluid used, implement safety measures such as protective covers in advance.
12. Do not forcibly rotate or swing the product even its resin body rotates. It may cause damage to the product or leakage.
13. Do not run excessive dry air than necessary. Deterioration of rubber parts may cause operation failure.
14. Do not clean or paint with solvents. It may cause damage to parts or malfunction due to painting.
15. Do not step on top of the product or place any objects on it. These may cause a fall, injury from the product tipping over or falling, or malfunction due to product damage.
16. The direction of air control varies depending on the product, check the instructions and the marking on the product before use. Installing the product with incorrect control direction may cause injury to the human body, damage to the equipment, or performance degradation.

Caution

1. Compressed air contains a large amount of condensate / drains (water, oxidized oil, tar, and foreign matter). Dehumidify the compressed air by using an after-cooler or a dryer and improve the air quality, since drains significantly reduce product performance. Also, place an air filter just before the compressed air supply section.
2. Contamination by foreign matters may cause product failure, malfunction, or performance degradation. It is also recommended to flush the inside of the piping before use and every appropriate period of time. When flushing products with push-in fittings, attach nipples or short tubes. The sealing parts of the push-in fitting may fly out of the product.
3. When inserting an ultra-soft tube into a push-in fitting, be sure to place an Insert Ring into the tube from the tube edge to be installed. If not used, it may cause the tube to slip out or leak.
4. Products using NBR as the rubber material for seal rubber, vacuum pads, and gaskets may crack under the influence of ozone, leading to failure. Ozone exists in higher than normal concentrations near static elimination air, clean-room, and the high-voltage motors, etc. As a countermeasure, material change from NBR to HNBR or FKM is necessary. Consult with PISCO for more information.
5. Special option “Oil-free” products may cause a very small amount of a fluid leakage. Consult with PISCO for further information when a fluid medium is liquid or the products are required to be used with severe environments.
6. In case of using non-PISCO brand tubes, make sure the tolerance of the outer tube diameter and tube hardness are within the limits of Table 1.

Table 1. The tolerance of the tube O.D.

mm size Nylon tube
(SHORE D63)
Polyurethane tube
(SHORE A98)

ø1.8mm

-

±0.05mm

ø2mm

-

±0.05mm

ø3mm

-

±0.15mm

ø4mm

±0.1mm

±0.15mm

ø6mm

±0.1mm

±0.15mm

ø8mm

±0.1mm

±0.15mm

ø10mm

±0.1mm

±0.15mm

ø12mm

±0.1mm

±0.15mm

ø16mm

±0.1mm

±0.15mm

Inch size Nylon tube
(SHORE D63)
Polyurethane tube
(SHORE A98)

ø1/8

±0.1mm

±0.15mm

ø5/32

±0.1mm

±0.15mm

ø3/16

±0.1mm

±0.15mm

ø1/4

±0.1mm

±0.15mm

ø5/16

±0.1mm

±0.15mm

ø3/8

±0.1mm

±0.15mm

ø1/2

±0.1mm

±0.15mm

ø5/8

±0.1mm

±0.15mm

7. As for Push-In Fitting Type, the functional part where tube is inserted may slightly slide due to an internal pressure change and this may generate dusts. Avoid using the products in the clean-room of ISO class from 1 to 5. Under operating conditions where the joint and tube are subject to swing, check the amount of dust generated by the actual operating condition before use.
8-1. Precautions for tube insertion (push-in fitting)

1. Make sure that the cut end face of the tube is at a right angle without a scratch or flaws on the tube surface or without elliptical deformations.

2. When installing the tube, if the tube is not inserted to the tube end (refer to Fig. above), it may cause fluid leakage.

3. After installation, pull the tube to make sure it will not come loose.

4. (4) The following phenomena may occur when the tube is attached, but it does not necessarily mean that the tube will slip out.
(i) When observing lock-claws from the front of the release-ring, it is difficult to see lock-claws.
(Ii) There is no click feeling even if you press Release-ring.
The most common causes of tube disengagement are (1) shear drop of the tip of the lock-claws and (2) abnormal (smaller) tube diameter. Therefore, even if the above phenomena (i) and (ii) occur, install the tube according to Procedures (1) to (3).

5. The oil-free specification product has a tighter tube fit than the standard type. Be sure to insert tube up to tube end.

8-2. Precautions for Tube Insertion (Compression Fitting)

1. Make sure that the cut end face of the tube is at a right angle without a scratch or flaws on the inner and outer surface.

2. Insert the tube through the cap nut to the base of the barb. Next, use a spanner to tighten the outer hexagonal column of the cap nut that has been passed through the tube.

3. When tightening the cap nut, refer to the tightening torque described in the connection/disconnection method of each product in the instructions.
*) Hold the tube when tightening the cap nut, since the tube may rotate along with the nut.

4. Make sure that the cap nut is against and hit the metal body. If not fit, loosen the nut, remove the tube and start over again from the process (1).

5. Make sure that there is no fluid leakage after tightening.

6. After installation, pull the tube to make sure it will not come loose.

9-1. Precautions for tube release (push-in fitting)

1. Make sure that the pressure inside the tube is zero before releasing the tube.

2. Push the release-ring of the push-in fitting evenly and deeply enough to pull out the tube toward oneself. If the release-ring is not pressed insufficiently, the tube may not come out, or the tube may be scratched and its debris may remain in the fitting.

9-2. Precautions for Tube Release (Compression Fitting)

1. Make sure that the pressure inside the tube is zero before releasing the tube.

2. Use a suitable tool on the hexagonal part of the cap nut to remove it. Then, disconnect / release the tube.

Precautions for installing product

*1) When installing the product, use an appropriate tool that does not interfere with performance, and tighten using the outer or inner hexagonal part or the outer square part. Also, when inserting a hex key into the inner hexagonal part, be careful not to let the tool come into contact with the lock-claws. Deformation at the tip of the lock-claws may reduce the holding function of the tube and cause the tube to slip out.

*2) When tightening the threaded body, refer to the tightening torque in the table blow and the allowable torque of the tool. Failure to tighten the threaded body with proper torque may result in damage to the product or tool, loosening of the thread, or leakage.

*3) Since the sealing performance of the thread is easily affected by the processing condition of the installation part, modify the installation part, use seal tape, or adjust the tightening torque according to the situation.

*4) For products whose piping direction cannot be changed by body rotation after tightening, adjust within the tightening torque range of the main body.

*5) Creep or distortion of the gasket may cause loosening in the tightening of the threaded body. Periodically check the looseness of the threaded body and retighten them with tightening torque if necessary.

Table 2 Tightening torque, Sealock (thread sealant) coating, and Gasket material

Thread Thread size Tightening torque Sealock color Gasket material

Metric thread

M3×0.5
M5×0.8
M6×1

0.7N·m
1~1.5N·m
2~2.7N·m

-

SPCC+NBR
SUS304+NBR

Metric thread

M3×0.5
M5×0.8
M6×0.75
M8×0.75

0.7N·m
1~1.5N·m
0.8~1N·m
1~2N·m

-

POM

Taper pipe thread

R1/8
R1/4
R3/8
R1/2

4.5~6.5N·m
7~9N·m
12.5~14.5N·m
20~22N·m

White

-

Unified thread

No.10-32UNF

1~1.5N·m

-

SPCC+NBR
SUS304+NBR

NPT thread

1/16-27NPT
1/8-27NPT
1/4-18NPT
3/8-18NPT
1/2-14NPT

4.5~6.5N·m
4.5~6.5N·m
7~9N·m
12.5~14.5N·m
20~22N·m

White

-

*) These values may differ for some products. Refer to the precautions and specification for each product as well.

11. Instructions for removal

1. When removing the product, use an appropriate tool that does not interfere with performance, and tighten using the outer or inner hexagonal part or the outer square part. Also, when inserting a hex key into the inner hexagonal part, be careful not to let the tool come into contact with the lock-claws. Deformation at the tip of the lock-claws may reduce the holding function of the tube and cause the tube to slip out.

2. Remove the sealant or a foreign substance on the removed mating thread. If the sealant adheres to the peripheral device, it may get into the devices and cause a malfunction.

12. Plumbing should be made so that fittings and tubes are not subjected to twisting, tension, moment loads, vibration, or physical impact. It may cause damaging the fitting, deforming the tube, or the tube to burst or come off.
13. Instructions for handling products

1. Impact applied by falling or else may cause damage or fluid leakage.

Common Safety Instructions for Fittings

Be sure to read the followings before selecting or using PISCO products. Read the detailed precautions, instructions and specifications for individual series.

Warning

1. Do not use water to clean products that cannot be used with water. It may cause malfunction.

Caution

1. Tighten the bulkhead nut of the bulkhead fittings within the specified tightening torque range.

Bulkhead nut tightening torque

Series Fitting size Tightening torque
Bulkhead Union (PM)
Tightening torque
Bulkhead Union P (PMP), Bulkhead Union Elbow (PML)

Tube Fitting

4

12.0~14.0N·m

0.4~0.6N·m

Tube Fitting

6

18.0~21.0N·m

0.9~1.1N·m

Tube Fitting

8

18.0~21.0N·m

1.1~1.3N·m

Tube Fitting

10

19.0~21.0N·m

2.3~2.7N·m

Tube Fitting

12

19.0~21.0N·m

2.7~3.3N·m

Tube Fitting

16

42.0~54.0N·m

-

Tube Fitting Mini

1.8

0.8~1.0N·m

-

Tube Fitting Mini

2

0.8~1.0N·m

-

Tube Fitting Mini

3

2.5~3.5N·m

-

Tube Fitting Mini

4

5.0~7.0N·m

-

Tube Fitting Mini

6

12.0~14.0N·m

-

2. Bulkhead nut may loose if an object between the nut is susceptible to deform or it has oil on the surface.

Common Safety Instructions for Vacuum Series

Be sure to read the followings before selecting or using PISCO products. Read the detailed precautions, instructions and specifications for individual series.

Warning

1. Fall prevention measures must be taken in advance to ensure safety where a dropping workpiece can cause danger.
2. Do not apply constant pressure of more than 0.1 MPa to the vacuum circuit. Since vacuum generators are not explosion-proof, there is a risk of damage to the products.
3. Be careful not to drop the vacuum pressure due to trouble with the supply air or power supply. Take safety measures to prevent workpiece from falling due to reduced suction force.
4. In a vacuum circuit where two or more pads are connected to a single vacuum generator, there is a risk that if one pad causes suction failure (leakage), the other pads will detach due to a drop in vacuum pressure.
5. Do not block the exhaust port of the vacuum generator or use the vacuum generator in such a way that the exhaust resistance increases. It may cause no vacuum or drop of vacuum pressure degree.
6. Do not wash with water. It may cause malfunction.

Caution

1. Abnormal noise (buzzing noise) may be produced at the supply pressure just before the vacuum reaches its peak. In this abnormal noise state, the characteristics are unstable and the noise becomes loud. Reset the supply pressure, as this may affect the sensor and cause trouble.

*) *Pressure range in which abnormal noise (buzzing noise) occurs is affected by atmospheric pressure.

2. The effective cross-sectional area of the supply pressure side of the vacuum generator should be three times the nozzle cross-sectional area as a guide when selecting piping and equipment. Insufficient supply flow rate may cause poor performance.
3. Do not use a lubricator on products.
4. Check each port of the vacuum generator according to the outline dimensional drawing in the instructions and the indication on the product, and carrying out the plumbing . Incorrect plumbing may cause damage to the product.
5. The pressure sensor and the vacuum generator with pressure sensor should be installed at the end of the vacuum line as far as possible. If the distance between the pressure sensor and the end of the vacuum line is long, the pipe resistance may increase and the degree of vacuum in the sensor may be high even when there is no suction, which may cause the pressure sensor to malfunction. Be sure to evaluate the products in an actual system.
6. The vacuum plumbing should be as short as possible and the internal diameter as large as possible. Longer pipes and narrower internal diameters may cause delays in the response time during suctioning and vacuum breaking and may not secure required suction flow.
7. Keep the piping for vacuum, centralized exhaust, pilot exhaust, and supply as short as possible. The original performance of the vacuum equipment may not be fully demonstrated due to piping resistance.
8. Keep the piping for vacuum, centralized exhaust, pilot exhaust, and supply as short as possible. The original performance of the vacuum equipment may not be fully demonstrated due to piping resistance.
9. Since the vacuum characteristics are based on our measurement conditions, it may not be possible to secure the suction flow rate specifications depending on the vacuum piping conditions.
10. The nozzle and diffuser of the vacuum generator should be cleaned regularly as clogging reduces its performance. When cleaning, be sure to understand the removal/installation and cleaning instructions given in the instructions.
11. Periodically perform maintenance and inspection of the silencer element of the vacuum generator and the filter element of the vacuum filter. Clogged element may result in poor performance or cause problems.
12. When replacing the element, be sure to understand the instructions for replacing the element in the instructions.
13. Do not use in areas exposed to water, oil or dust. Since it is not drip-proof or explosion-proof, it may cause malfunction. Take appropriate protective measures when using.
14. For handling of the fitting part, refer to the "Common Safety Instructions for Fittings", and for mounting and removal of the direct mounting type product with thread, refer to the "10. Mounting instructions" and "11. Removing instructions" of "Common Safety Instructions for Products Listed".
15. For handling of electronic pressure sensors, refer to "Common Safety Instructions for Sensors" and individual "Detailed Safety Instructions" of each series.
16. For the handling of mechanical pressure sensors, refer to "Common Safety Instructions for Mechanical Pressure Sensors".
17. The material of plastic filter cover for VG, VK, VJ, VZ, VX, VJP, VZP, VXP/VXPT, VFU2 and VFU3 series is PCTG. Avoid the adherence of chemicals below to the products, and do not use them under those chemical environments.

●Table. Chemical Name

Chemical Name Chemical Name Chemical Name

Acetone

Silicone oil

Methyl alcohol (Methanol)

Aniline

Ammonium hydroxide

Lacquer

Hydrogen chloride gas

Ammonium hydroxide concentrated

Sulfuric acid (10% 20°C)

Chloroform

Trichloroethylene (Trichlene)

Sulfuric acid concentrated (20°C)

Ethyl acetate

Toluene

Sulfuric acid concentrated (70℃)

Carbon tetrachloride

Ethylene dichloride

Cyclohexane

Lactic acid (high temperature)

Dimethylformamide (DMF)

Lactic acid (low temperature)

Nitric acid (61% 20°C) (concentrated nitric acid solution)

Phenol

Silicone grease

Benzene (Benzol)

*) There are more chemicals which should be avoided. Contact us for the use under chemical circumstance.

18. The material of plastic filter cover for VQ, VQP, VFU0 and VFU1 series is PA. Avoid the adherence of chemicals below to the products, and do not use them under those chemical environments.

●Table. Chemical Name

Chemical Name Chemical Name Chemical Name

Aniline

Chromic acid (10% 70°C)

Water vapor (260°C or higher)

Ethylene chlorohydrin

Chromic acid (25% 70°C)

Tetrachloroethane

Epichlorohydrin

Chlorosulfonic acid

Tetrahydrofuran

Chloroethyl (Chloroethane)

Chlorotoluene

Trichloroethylene (Trichlene)

Thionyl chloride

Chlorobenzene

Ethylene dichloride

Benzyl chloride

Chloroform

Methylene dichloride

Methyl chloride

Acetic acid (Acetic anhydride)

Nitrobenzene

Hydrochloric acid (20% 80°C)

Hypochlorous acid

Carbon disulfide

Hydrochloric acid (37% 20℃)

Calcium hypochlorite

Perchloroethylene

Aqua regia

Calcium hypochlorite (5% 70°C)

Phenol

Ozone

Ethane tetrachloride

Benzyl chloride

Sodium peroxide

Carbon tetrachloride

Acetic anhydride

Caustic soda (30% 70°C)

Dichlorobenzene

Mono-chlorobenzene (Chlorobenzene)

Potassium permanganate

Dimethylformamide (DMF)

Mono-chloroethanoic acid (Chloroethanoic acid)

Formic acid (50% 20°C)

Hydrobromic Acid (20% 20°C)

Sulfuric acid concentrated (20°C)

Formic acid (90% 20°C)

Hydrobromic Acid (40% 20°C)

Sulfuric acid concentrated (Oleum)

Cresol

Bromine

Phosphoric acid concentrated

Chromic acid (2% 70°C)

Water vapor (204°C ~ 260°C)

Chromic acid (2% 50℃)

Water vapor (204°C or lower)

*) There are more chemicals which should be avoided. Contact us for the use under chemical circumstance.

Common Safety Instructions for Mechanical Pressure Sensors

Be sure to read the followings before selecting or using PISCO products. Read the detailed precautions, instructions and specifications for individual series.

Warning

1. Do not use in areas exposed to water, oil or dust. Since the mechanical pressure sensor is not drip-proof or dust-proof, it may cause malfunction.
2. Applying 0.5 MPa instantaneously to a mechanical vacuum sensor does not affect on its performance, but do not apply a pressure of 0.2 MPa or more constantly. There is a risk of damage to the switch if it is constantly applied.
3. Do not wash with water. It may cause malfunction.

Caution

1. Be sure to turn off the power before wiring the mechanical pressure sensor. When wiring, check the color of the lead wires to avoid incorrect wiring.
2. Do not apply strong tensile force or extreme bending to the lead wires. There is a risk of wire breakage.
3. Do not use a lubricator on products.

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